User's Manual Part 3

10-20
in Masimo Gas Master.
4. Wait about 1O seconds until the "Atm press - cuvette press [kPa]"value as shown by the
Masimo Gas Master is stable. Note the value.
5. Wait additional 10 seconds.
6. Check that the "Atm press - cuvette press [kPa]"value has not changed more than 3 kPa in
10 seconds.
7. If the "Atm press - cuvette press [kPa}" value changes more than 3kPa in 10 seconds,
check tubing and fittings for leakage. If the problem persists, return the analyzer to Masimo
Sweden (see section 9).
Note: In step 5, if the "Atm press - cuvette press [kPa]" is less than 6 kPa, repeat
steps 1 to 3 blocking the exhaust port quicker.
Gas span calibration
Only perform the gas span calibration if the gas span check fails repeatedly.
Before performing the gas span calibration, ensure that the SETO2 and SETN2O values are
set (if applicable for your gas analyzer model) correctly to match the corresponding calibration
gas.
Span calibration can be performed using gases within the ranges:
4.0% ≤ CO
2
≤ 11.0%
45% ≤ O
2
≤ 100% - for ISA Multigas with Servomex only
30% ≤ N
2
O ≤ 100% - for ISA Multigas only
2.0%
≤
DES
≤
12.0% - for ISA Multigas only
The accuracy of the individual components of the calibration gas mixture shall each have
an accuracy of at least +/-0.03 vol% or +/-(0.02 vol% +0.1% of reading), whichever is
greater.
Note : DES shall be used for span calibration of all 5 agents (HAL, ENF, ISO, SEV, DES).
Note: Gas span calibration should be performed only for the gas components that failed
in the Gas span check.
1. Warm up the ISA gas analyzer for at least 1 min
2. Send "Pre span calibration zeroing" and make sure that the surrounding gas is normal air
(21%
O
2
and 0% CO
2
),
3. For each gas that failed the Gas span check, perform step 4 to 7. Always
perform the span
calibration with the gases in order
O
2
, N
2
O , DES and CO
2
Example: Span calibration of O
2
and CO
2
only, start with O
2
then CO
2
.
4. Supply the calibration gas and wait for at least 30 seconds.
5. Send the corresponding span calibration command.
6. Wait until the gas span calibration is no longer in progress. The calibrationgas can be
turned off when "span calibration is in progress" no longer is set, but the
O
2
span
calibration
continues for about 40 s with a special zeroing during which the Servomex
paramagnetic
O
2
sensor is sensitive to mechanical movements.